Commit | Line | Data |
---|---|---|
2744e8af LW |
1 | /* |
2 | * Core driver for the pin control subsystem | |
3 | * | |
befe5bdf | 4 | * Copyright (C) 2011-2012 ST-Ericsson SA |
2744e8af LW |
5 | * Written on behalf of Linaro for ST-Ericsson |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
b2b3e66e SW |
10 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
11 | * | |
2744e8af LW |
12 | * License terms: GNU General Public License (GPL) version 2 |
13 | */ | |
14 | #define pr_fmt(fmt) "pinctrl core: " fmt | |
15 | ||
16 | #include <linux/kernel.h> | |
ab78029e | 17 | #include <linux/kref.h> |
a5a697cd | 18 | #include <linux/export.h> |
2744e8af LW |
19 | #include <linux/init.h> |
20 | #include <linux/device.h> | |
21 | #include <linux/slab.h> | |
2744e8af LW |
22 | #include <linux/err.h> |
23 | #include <linux/list.h> | |
2744e8af LW |
24 | #include <linux/sysfs.h> |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/seq_file.h> | |
6d4ca1fb | 27 | #include <linux/pinctrl/consumer.h> |
2744e8af LW |
28 | #include <linux/pinctrl/pinctrl.h> |
29 | #include <linux/pinctrl/machine.h> | |
51e13c24 | 30 | #include <asm-generic/gpio.h> |
2744e8af | 31 | #include "core.h" |
57291ce2 | 32 | #include "devicetree.h" |
2744e8af | 33 | #include "pinmux.h" |
ae6b4d85 | 34 | #include "pinconf.h" |
2744e8af | 35 | |
b2b3e66e | 36 | |
5b3aa5f7 DA |
37 | static bool pinctrl_dummy_state; |
38 | ||
57b676f9 SW |
39 | /* Mutex taken by all entry points */ |
40 | DEFINE_MUTEX(pinctrl_mutex); | |
41 | ||
42 | /* Global list of pin control devices (struct pinctrl_dev) */ | |
57291ce2 | 43 | LIST_HEAD(pinctrldev_list); |
2744e8af | 44 | |
57b676f9 | 45 | /* List of pin controller handles (struct pinctrl) */ |
befe5bdf LW |
46 | static LIST_HEAD(pinctrl_list); |
47 | ||
57b676f9 | 48 | /* List of pinctrl maps (struct pinctrl_maps) */ |
6f9e41f4 | 49 | LIST_HEAD(pinctrl_maps); |
b2b3e66e | 50 | |
befe5bdf | 51 | |
5b3aa5f7 DA |
52 | /** |
53 | * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support | |
54 | * | |
55 | * Usually this function is called by platforms without pinctrl driver support | |
56 | * but run with some shared drivers using pinctrl APIs. | |
57 | * After calling this function, the pinctrl core will return successfully | |
58 | * with creating a dummy state for the driver to keep going smoothly. | |
59 | */ | |
60 | void pinctrl_provide_dummies(void) | |
61 | { | |
62 | pinctrl_dummy_state = true; | |
63 | } | |
64 | ||
2744e8af LW |
65 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
66 | { | |
67 | /* We're not allowed to register devices without name */ | |
68 | return pctldev->desc->name; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
71 | ||
d6e99abb HZ |
72 | const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev) |
73 | { | |
74 | return dev_name(pctldev->dev); | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname); | |
77 | ||
2744e8af LW |
78 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) |
79 | { | |
80 | return pctldev->driver_data; | |
81 | } | |
82 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
83 | ||
84 | /** | |
9dfac4fd LW |
85 | * get_pinctrl_dev_from_devname() - look up pin controller device |
86 | * @devname: the name of a device instance, as returned by dev_name() | |
2744e8af LW |
87 | * |
88 | * Looks up a pin control device matching a certain device name or pure device | |
89 | * pointer, the pure device pointer will take precedence. | |
90 | */ | |
9dfac4fd | 91 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
2744e8af LW |
92 | { |
93 | struct pinctrl_dev *pctldev = NULL; | |
94 | bool found = false; | |
95 | ||
9dfac4fd LW |
96 | if (!devname) |
97 | return NULL; | |
98 | ||
2744e8af | 99 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
9dfac4fd | 100 | if (!strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
101 | /* Matched on device name */ |
102 | found = true; | |
103 | break; | |
104 | } | |
105 | } | |
2744e8af LW |
106 | |
107 | return found ? pctldev : NULL; | |
108 | } | |
109 | ||
ae6b4d85 LW |
110 | /** |
111 | * pin_get_from_name() - look up a pin number from a name | |
112 | * @pctldev: the pin control device to lookup the pin on | |
113 | * @name: the name of the pin to look up | |
114 | */ | |
115 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
116 | { | |
706e8520 | 117 | unsigned i, pin; |
ae6b4d85 | 118 | |
706e8520 CP |
119 | /* The pin number can be retrived from the pin controller descriptor */ |
120 | for (i = 0; i < pctldev->desc->npins; i++) { | |
ae6b4d85 LW |
121 | struct pin_desc *desc; |
122 | ||
706e8520 | 123 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 LW |
124 | desc = pin_desc_get(pctldev, pin); |
125 | /* Pin space may be sparse */ | |
126 | if (desc == NULL) | |
127 | continue; | |
128 | if (desc->name && !strcmp(name, desc->name)) | |
129 | return pin; | |
130 | } | |
131 | ||
132 | return -EINVAL; | |
133 | } | |
134 | ||
dcb5dbc3 DA |
135 | /** |
136 | * pin_get_name_from_id() - look up a pin name from a pin id | |
137 | * @pctldev: the pin control device to lookup the pin on | |
138 | * @name: the name of the pin to look up | |
139 | */ | |
140 | const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) | |
141 | { | |
142 | const struct pin_desc *desc; | |
143 | ||
144 | desc = pin_desc_get(pctldev, pin); | |
145 | if (desc == NULL) { | |
146 | dev_err(pctldev->dev, "failed to get pin(%d) name\n", | |
147 | pin); | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | return desc->name; | |
152 | } | |
153 | ||
2744e8af LW |
154 | /** |
155 | * pin_is_valid() - check if pin exists on controller | |
156 | * @pctldev: the pin control device to check the pin on | |
157 | * @pin: pin to check, use the local pin controller index number | |
158 | * | |
159 | * This tells us whether a certain pin exist on a certain pin controller or | |
160 | * not. Pin lists may be sparse, so some pins may not exist. | |
161 | */ | |
162 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
163 | { | |
164 | struct pin_desc *pindesc; | |
165 | ||
166 | if (pin < 0) | |
167 | return false; | |
168 | ||
57b676f9 | 169 | mutex_lock(&pinctrl_mutex); |
2744e8af | 170 | pindesc = pin_desc_get(pctldev, pin); |
57b676f9 | 171 | mutex_unlock(&pinctrl_mutex); |
2744e8af | 172 | |
57b676f9 | 173 | return pindesc != NULL; |
2744e8af LW |
174 | } |
175 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
176 | ||
177 | /* Deletes a range of pin descriptors */ | |
178 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
179 | const struct pinctrl_pin_desc *pins, | |
180 | unsigned num_pins) | |
181 | { | |
182 | int i; | |
183 | ||
2744e8af LW |
184 | for (i = 0; i < num_pins; i++) { |
185 | struct pin_desc *pindesc; | |
186 | ||
187 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
188 | pins[i].number); | |
189 | if (pindesc != NULL) { | |
190 | radix_tree_delete(&pctldev->pin_desc_tree, | |
191 | pins[i].number); | |
ca53c5f1 LW |
192 | if (pindesc->dynamic_name) |
193 | kfree(pindesc->name); | |
2744e8af LW |
194 | } |
195 | kfree(pindesc); | |
196 | } | |
2744e8af LW |
197 | } |
198 | ||
199 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
200 | unsigned number, const char *name) | |
201 | { | |
202 | struct pin_desc *pindesc; | |
203 | ||
204 | pindesc = pin_desc_get(pctldev, number); | |
205 | if (pindesc != NULL) { | |
206 | pr_err("pin %d already registered on %s\n", number, | |
207 | pctldev->desc->name); | |
208 | return -EINVAL; | |
209 | } | |
210 | ||
211 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
95dcd4ae SW |
212 | if (pindesc == NULL) { |
213 | dev_err(pctldev->dev, "failed to alloc struct pin_desc\n"); | |
2744e8af | 214 | return -ENOMEM; |
95dcd4ae | 215 | } |
ae6b4d85 | 216 | |
2744e8af LW |
217 | /* Set owner */ |
218 | pindesc->pctldev = pctldev; | |
219 | ||
9af1e44f | 220 | /* Copy basic pin info */ |
8dc6ae4d | 221 | if (name) { |
ca53c5f1 LW |
222 | pindesc->name = name; |
223 | } else { | |
224 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
eb26cc9c SK |
225 | if (pindesc->name == NULL) { |
226 | kfree(pindesc); | |
ca53c5f1 | 227 | return -ENOMEM; |
eb26cc9c | 228 | } |
ca53c5f1 LW |
229 | pindesc->dynamic_name = true; |
230 | } | |
2744e8af | 231 | |
2744e8af | 232 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); |
2744e8af | 233 | pr_debug("registered pin %d (%s) on %s\n", |
ca53c5f1 | 234 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
235 | return 0; |
236 | } | |
237 | ||
238 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
239 | struct pinctrl_pin_desc const *pins, | |
240 | unsigned num_descs) | |
241 | { | |
242 | unsigned i; | |
243 | int ret = 0; | |
244 | ||
245 | for (i = 0; i < num_descs; i++) { | |
246 | ret = pinctrl_register_one_pin(pctldev, | |
247 | pins[i].number, pins[i].name); | |
248 | if (ret) | |
249 | return ret; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | /** | |
256 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
257 | * @pctldev: pin controller device to check | |
258 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
259 | * | |
260 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
261 | * controller, return the range or NULL | |
262 | */ | |
263 | static struct pinctrl_gpio_range * | |
264 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
265 | { | |
266 | struct pinctrl_gpio_range *range = NULL; | |
267 | ||
268 | /* Loop over the ranges */ | |
2744e8af LW |
269 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
270 | /* Check if we're in the valid range */ | |
271 | if (gpio >= range->base && | |
272 | gpio < range->base + range->npins) { | |
2744e8af LW |
273 | return range; |
274 | } | |
275 | } | |
2744e8af LW |
276 | |
277 | return NULL; | |
278 | } | |
279 | ||
51e13c24 HZ |
280 | /** |
281 | * pinctrl_ready_for_gpio_range() - check if other GPIO pins of | |
282 | * the same GPIO chip are in range | |
283 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
284 | * | |
285 | * This function is complement of pinctrl_match_gpio_range(). If the return | |
286 | * value of pinctrl_match_gpio_range() is NULL, this function could be used | |
287 | * to check whether pinctrl device is ready or not. Maybe some GPIO pins | |
288 | * of the same GPIO chip don't have back-end pinctrl interface. | |
289 | * If the return value is true, it means that pinctrl device is ready & the | |
290 | * certain GPIO pin doesn't have back-end pinctrl device. If the return value | |
291 | * is false, it means that pinctrl device may not be ready. | |
292 | */ | |
293 | static bool pinctrl_ready_for_gpio_range(unsigned gpio) | |
294 | { | |
295 | struct pinctrl_dev *pctldev; | |
296 | struct pinctrl_gpio_range *range = NULL; | |
297 | struct gpio_chip *chip = gpio_to_chip(gpio); | |
298 | ||
299 | /* Loop over the pin controllers */ | |
300 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
301 | /* Loop over the ranges */ | |
302 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
303 | /* Check if any gpio range overlapped with gpio chip */ | |
304 | if (range->base + range->npins - 1 < chip->base || | |
305 | range->base > chip->base + chip->ngpio - 1) | |
306 | continue; | |
307 | return true; | |
308 | } | |
309 | } | |
310 | return false; | |
311 | } | |
312 | ||
2744e8af LW |
313 | /** |
314 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
315 | * @gpio: the pin to locate the pin controller for | |
316 | * @outdev: the pin control device if found | |
317 | * @outrange: the GPIO range if found | |
318 | * | |
319 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
320 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
4650b7cb DA |
321 | * -EPROBE_DEFER if the GPIO range could not be found in any device since it |
322 | * may still have not been registered. | |
2744e8af | 323 | */ |
4ecce45d SW |
324 | static int pinctrl_get_device_gpio_range(unsigned gpio, |
325 | struct pinctrl_dev **outdev, | |
326 | struct pinctrl_gpio_range **outrange) | |
2744e8af LW |
327 | { |
328 | struct pinctrl_dev *pctldev = NULL; | |
329 | ||
330 | /* Loop over the pin controllers */ | |
2744e8af LW |
331 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
332 | struct pinctrl_gpio_range *range; | |
333 | ||
334 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
335 | if (range != NULL) { | |
336 | *outdev = pctldev; | |
337 | *outrange = range; | |
2744e8af LW |
338 | return 0; |
339 | } | |
340 | } | |
2744e8af | 341 | |
4650b7cb | 342 | return -EPROBE_DEFER; |
2744e8af LW |
343 | } |
344 | ||
345 | /** | |
346 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
347 | * @pctldev: pin controller device to add the range to | |
348 | * @range: the GPIO range to add | |
349 | * | |
350 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
351 | * this to register handled ranges after registering your pin controller. | |
352 | */ | |
353 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
354 | struct pinctrl_gpio_range *range) | |
355 | { | |
57b676f9 | 356 | mutex_lock(&pinctrl_mutex); |
8b9c139f | 357 | list_add_tail(&range->node, &pctldev->gpio_ranges); |
57b676f9 | 358 | mutex_unlock(&pinctrl_mutex); |
2744e8af | 359 | } |
4ecce45d | 360 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
2744e8af | 361 | |
3e5e00b6 DA |
362 | void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, |
363 | struct pinctrl_gpio_range *ranges, | |
364 | unsigned nranges) | |
365 | { | |
366 | int i; | |
367 | ||
368 | for (i = 0; i < nranges; i++) | |
369 | pinctrl_add_gpio_range(pctldev, &ranges[i]); | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges); | |
372 | ||
192c369c | 373 | struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, |
f23f1516 SH |
374 | struct pinctrl_gpio_range *range) |
375 | { | |
376 | struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname); | |
377 | ||
dfa97515 LW |
378 | /* |
379 | * If we can't find this device, let's assume that is because | |
380 | * it has not probed yet, so the driver trying to register this | |
381 | * range need to defer probing. | |
382 | */ | |
f23f1516 | 383 | if (!pctldev) |
dfa97515 | 384 | return ERR_PTR(-EPROBE_DEFER); |
f23f1516 SH |
385 | |
386 | pinctrl_add_gpio_range(pctldev, range); | |
387 | return pctldev; | |
388 | } | |
192c369c | 389 | EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); |
f23f1516 | 390 | |
9afbefb2 LW |
391 | /** |
392 | * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin | |
393 | * @pctldev: the pin controller device to look in | |
394 | * @pin: a controller-local number to find the range for | |
395 | */ | |
396 | struct pinctrl_gpio_range * | |
397 | pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, | |
398 | unsigned int pin) | |
399 | { | |
400 | struct pinctrl_gpio_range *range = NULL; | |
401 | ||
402 | /* Loop over the ranges */ | |
403 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
404 | /* Check if we're in the valid range */ | |
405 | if (pin >= range->pin_base && | |
406 | pin < range->pin_base + range->npins) { | |
407 | return range; | |
408 | } | |
409 | } | |
410 | ||
411 | return NULL; | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); | |
414 | ||
7e10ee68 VK |
415 | /** |
416 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
417 | * @pctldev: pin controller device to remove the range from | |
418 | * @range: the GPIO range to remove | |
419 | */ | |
420 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
421 | struct pinctrl_gpio_range *range) | |
422 | { | |
423 | mutex_lock(&pinctrl_mutex); | |
424 | list_del(&range->node); | |
425 | mutex_unlock(&pinctrl_mutex); | |
426 | } | |
427 | EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); | |
428 | ||
7afde8ba LW |
429 | /** |
430 | * pinctrl_get_group_selector() - returns the group selector for a group | |
431 | * @pctldev: the pin controller handling the group | |
432 | * @pin_group: the pin group to look up | |
433 | */ | |
434 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
435 | const char *pin_group) | |
436 | { | |
437 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
d1e90e9e | 438 | unsigned ngroups = pctlops->get_groups_count(pctldev); |
7afde8ba LW |
439 | unsigned group_selector = 0; |
440 | ||
d1e90e9e | 441 | while (group_selector < ngroups) { |
7afde8ba LW |
442 | const char *gname = pctlops->get_group_name(pctldev, |
443 | group_selector); | |
444 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 445 | dev_dbg(pctldev->dev, |
7afde8ba LW |
446 | "found group selector %u for %s\n", |
447 | group_selector, | |
448 | pin_group); | |
449 | return group_selector; | |
450 | } | |
451 | ||
452 | group_selector++; | |
453 | } | |
454 | ||
51cd24ee | 455 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
456 | pin_group); |
457 | ||
458 | return -EINVAL; | |
459 | } | |
460 | ||
befe5bdf LW |
461 | /** |
462 | * pinctrl_request_gpio() - request a single pin to be used in as GPIO | |
463 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
464 | * | |
465 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
466 | * as part of their gpio_request() semantics, platforms and individual drivers | |
467 | * shall *NOT* request GPIO pins to be muxed in. | |
468 | */ | |
469 | int pinctrl_request_gpio(unsigned gpio) | |
470 | { | |
471 | struct pinctrl_dev *pctldev; | |
472 | struct pinctrl_gpio_range *range; | |
473 | int ret; | |
474 | int pin; | |
475 | ||
57b676f9 SW |
476 | mutex_lock(&pinctrl_mutex); |
477 | ||
befe5bdf | 478 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
57b676f9 | 479 | if (ret) { |
51e13c24 HZ |
480 | if (pinctrl_ready_for_gpio_range(gpio)) |
481 | ret = 0; | |
57b676f9 | 482 | mutex_unlock(&pinctrl_mutex); |
4650b7cb | 483 | return ret; |
57b676f9 | 484 | } |
befe5bdf LW |
485 | |
486 | /* Convert to the pin controllers number space */ | |
487 | pin = gpio - range->base + range->pin_base; | |
488 | ||
57b676f9 SW |
489 | ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
490 | ||
491 | mutex_unlock(&pinctrl_mutex); | |
492 | return ret; | |
befe5bdf LW |
493 | } |
494 | EXPORT_SYMBOL_GPL(pinctrl_request_gpio); | |
495 | ||
496 | /** | |
497 | * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO | |
498 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
499 | * | |
500 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
501 | * as part of their gpio_free() semantics, platforms and individual drivers | |
502 | * shall *NOT* request GPIO pins to be muxed out. | |
503 | */ | |
504 | void pinctrl_free_gpio(unsigned gpio) | |
505 | { | |
506 | struct pinctrl_dev *pctldev; | |
507 | struct pinctrl_gpio_range *range; | |
508 | int ret; | |
509 | int pin; | |
510 | ||
57b676f9 SW |
511 | mutex_lock(&pinctrl_mutex); |
512 | ||
befe5bdf | 513 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
57b676f9 SW |
514 | if (ret) { |
515 | mutex_unlock(&pinctrl_mutex); | |
befe5bdf | 516 | return; |
57b676f9 | 517 | } |
befe5bdf LW |
518 | |
519 | /* Convert to the pin controllers number space */ | |
520 | pin = gpio - range->base + range->pin_base; | |
521 | ||
57b676f9 SW |
522 | pinmux_free_gpio(pctldev, pin, range); |
523 | ||
524 | mutex_unlock(&pinctrl_mutex); | |
befe5bdf LW |
525 | } |
526 | EXPORT_SYMBOL_GPL(pinctrl_free_gpio); | |
527 | ||
528 | static int pinctrl_gpio_direction(unsigned gpio, bool input) | |
529 | { | |
530 | struct pinctrl_dev *pctldev; | |
531 | struct pinctrl_gpio_range *range; | |
532 | int ret; | |
533 | int pin; | |
534 | ||
535 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
536 | if (ret) | |
537 | return ret; | |
538 | ||
539 | /* Convert to the pin controllers number space */ | |
540 | pin = gpio - range->base + range->pin_base; | |
541 | ||
542 | return pinmux_gpio_direction(pctldev, range, pin, input); | |
543 | } | |
544 | ||
545 | /** | |
546 | * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode | |
547 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
548 | * | |
549 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
550 | * as part of their gpio_direction_input() semantics, platforms and individual | |
551 | * drivers shall *NOT* touch pin control GPIO calls. | |
552 | */ | |
553 | int pinctrl_gpio_direction_input(unsigned gpio) | |
554 | { | |
57b676f9 SW |
555 | int ret; |
556 | mutex_lock(&pinctrl_mutex); | |
557 | ret = pinctrl_gpio_direction(gpio, true); | |
558 | mutex_unlock(&pinctrl_mutex); | |
559 | return ret; | |
befe5bdf LW |
560 | } |
561 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); | |
562 | ||
563 | /** | |
564 | * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode | |
565 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
566 | * | |
567 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
568 | * as part of their gpio_direction_output() semantics, platforms and individual | |
569 | * drivers shall *NOT* touch pin control GPIO calls. | |
570 | */ | |
571 | int pinctrl_gpio_direction_output(unsigned gpio) | |
572 | { | |
57b676f9 SW |
573 | int ret; |
574 | mutex_lock(&pinctrl_mutex); | |
575 | ret = pinctrl_gpio_direction(gpio, false); | |
576 | mutex_unlock(&pinctrl_mutex); | |
577 | return ret; | |
befe5bdf LW |
578 | } |
579 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); | |
580 | ||
6e5e959d SW |
581 | static struct pinctrl_state *find_state(struct pinctrl *p, |
582 | const char *name) | |
befe5bdf | 583 | { |
6e5e959d SW |
584 | struct pinctrl_state *state; |
585 | ||
586 | list_for_each_entry(state, &p->states, node) | |
587 | if (!strcmp(state->name, name)) | |
588 | return state; | |
589 | ||
590 | return NULL; | |
591 | } | |
592 | ||
593 | static struct pinctrl_state *create_state(struct pinctrl *p, | |
594 | const char *name) | |
595 | { | |
596 | struct pinctrl_state *state; | |
597 | ||
598 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
599 | if (state == NULL) { | |
600 | dev_err(p->dev, | |
601 | "failed to alloc struct pinctrl_state\n"); | |
602 | return ERR_PTR(-ENOMEM); | |
603 | } | |
604 | ||
605 | state->name = name; | |
606 | INIT_LIST_HEAD(&state->settings); | |
607 | ||
608 | list_add_tail(&state->node, &p->states); | |
609 | ||
610 | return state; | |
611 | } | |
612 | ||
613 | static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) | |
614 | { | |
615 | struct pinctrl_state *state; | |
7ecdb16f | 616 | struct pinctrl_setting *setting; |
6e5e959d | 617 | int ret; |
befe5bdf | 618 | |
6e5e959d SW |
619 | state = find_state(p, map->name); |
620 | if (!state) | |
621 | state = create_state(p, map->name); | |
622 | if (IS_ERR(state)) | |
623 | return PTR_ERR(state); | |
befe5bdf | 624 | |
1e2082b5 SW |
625 | if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
626 | return 0; | |
627 | ||
6e5e959d SW |
628 | setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
629 | if (setting == NULL) { | |
630 | dev_err(p->dev, | |
631 | "failed to alloc struct pinctrl_setting\n"); | |
632 | return -ENOMEM; | |
633 | } | |
befe5bdf | 634 | |
1e2082b5 SW |
635 | setting->type = map->type; |
636 | ||
6e5e959d SW |
637 | setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
638 | if (setting->pctldev == NULL) { | |
6e5e959d | 639 | kfree(setting); |
89216494 LW |
640 | /* Do not defer probing of hogs (circular loop) */ |
641 | if (!strcmp(map->ctrl_dev_name, map->dev_name)) | |
642 | return -ENODEV; | |
c05127c4 LW |
643 | /* |
644 | * OK let us guess that the driver is not there yet, and | |
645 | * let's defer obtaining this pinctrl handle to later... | |
646 | */ | |
89216494 LW |
647 | dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
648 | map->ctrl_dev_name); | |
c05127c4 | 649 | return -EPROBE_DEFER; |
6e5e959d SW |
650 | } |
651 | ||
1a78958d LW |
652 | setting->dev_name = map->dev_name; |
653 | ||
1e2082b5 SW |
654 | switch (map->type) { |
655 | case PIN_MAP_TYPE_MUX_GROUP: | |
656 | ret = pinmux_map_to_setting(map, setting); | |
657 | break; | |
658 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
659 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
660 | ret = pinconf_map_to_setting(map, setting); | |
661 | break; | |
662 | default: | |
663 | ret = -EINVAL; | |
664 | break; | |
665 | } | |
6e5e959d SW |
666 | if (ret < 0) { |
667 | kfree(setting); | |
668 | return ret; | |
669 | } | |
670 | ||
671 | list_add_tail(&setting->node, &state->settings); | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | static struct pinctrl *find_pinctrl(struct device *dev) | |
677 | { | |
678 | struct pinctrl *p; | |
679 | ||
1e2082b5 | 680 | list_for_each_entry(p, &pinctrl_list, node) |
6e5e959d SW |
681 | if (p->dev == dev) |
682 | return p; | |
683 | ||
684 | return NULL; | |
685 | } | |
686 | ||
687 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist); | |
688 | ||
689 | static struct pinctrl *create_pinctrl(struct device *dev) | |
690 | { | |
691 | struct pinctrl *p; | |
692 | const char *devname; | |
693 | struct pinctrl_maps *maps_node; | |
694 | int i; | |
695 | struct pinctrl_map const *map; | |
696 | int ret; | |
befe5bdf LW |
697 | |
698 | /* | |
699 | * create the state cookie holder struct pinctrl for each | |
700 | * mapping, this is what consumers will get when requesting | |
701 | * a pin control handle with pinctrl_get() | |
702 | */ | |
02f5b989 | 703 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
95dcd4ae SW |
704 | if (p == NULL) { |
705 | dev_err(dev, "failed to alloc struct pinctrl\n"); | |
befe5bdf | 706 | return ERR_PTR(-ENOMEM); |
95dcd4ae | 707 | } |
7ecdb16f | 708 | p->dev = dev; |
6e5e959d | 709 | INIT_LIST_HEAD(&p->states); |
57291ce2 SW |
710 | INIT_LIST_HEAD(&p->dt_maps); |
711 | ||
712 | ret = pinctrl_dt_to_map(p); | |
713 | if (ret < 0) { | |
714 | kfree(p); | |
715 | return ERR_PTR(ret); | |
716 | } | |
6e5e959d SW |
717 | |
718 | devname = dev_name(dev); | |
befe5bdf LW |
719 | |
720 | /* Iterate over the pin control maps to locate the right ones */ | |
b2b3e66e | 721 | for_each_maps(maps_node, i, map) { |
7ecdb16f SW |
722 | /* Map must be for this device */ |
723 | if (strcmp(map->dev_name, devname)) | |
724 | continue; | |
725 | ||
6e5e959d | 726 | ret = add_setting(p, map); |
89216494 LW |
727 | /* |
728 | * At this point the adding of a setting may: | |
729 | * | |
730 | * - Defer, if the pinctrl device is not yet available | |
731 | * - Fail, if the pinctrl device is not yet available, | |
732 | * AND the setting is a hog. We cannot defer that, since | |
733 | * the hog will kick in immediately after the device | |
734 | * is registered. | |
735 | * | |
736 | * If the error returned was not -EPROBE_DEFER then we | |
737 | * accumulate the errors to see if we end up with | |
738 | * an -EPROBE_DEFER later, as that is the worst case. | |
739 | */ | |
740 | if (ret == -EPROBE_DEFER) { | |
6e5e959d SW |
741 | pinctrl_put_locked(p, false); |
742 | return ERR_PTR(ret); | |
7ecdb16f | 743 | } |
befe5bdf | 744 | } |
89216494 LW |
745 | if (ret < 0) { |
746 | /* If some other error than deferral occured, return here */ | |
747 | pinctrl_put_locked(p, false); | |
748 | return ERR_PTR(ret); | |
749 | } | |
befe5bdf | 750 | |
ab78029e LW |
751 | kref_init(&p->users); |
752 | ||
b0666ba4 | 753 | /* Add the pinctrl handle to the global list */ |
8b9c139f | 754 | list_add_tail(&p->node, &pinctrl_list); |
befe5bdf LW |
755 | |
756 | return p; | |
6e5e959d | 757 | } |
7ecdb16f | 758 | |
6e5e959d SW |
759 | static struct pinctrl *pinctrl_get_locked(struct device *dev) |
760 | { | |
761 | struct pinctrl *p; | |
7ecdb16f | 762 | |
6e5e959d SW |
763 | if (WARN_ON(!dev)) |
764 | return ERR_PTR(-EINVAL); | |
765 | ||
ab78029e LW |
766 | /* |
767 | * See if somebody else (such as the device core) has already | |
768 | * obtained a handle to the pinctrl for this device. In that case, | |
769 | * return another pointer to it. | |
770 | */ | |
6e5e959d | 771 | p = find_pinctrl(dev); |
ab78029e LW |
772 | if (p != NULL) { |
773 | dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n"); | |
774 | kref_get(&p->users); | |
775 | return p; | |
776 | } | |
7ecdb16f | 777 | |
d599bfb3 | 778 | return create_pinctrl(dev); |
befe5bdf | 779 | } |
b2b3e66e SW |
780 | |
781 | /** | |
6e5e959d SW |
782 | * pinctrl_get() - retrieves the pinctrl handle for a device |
783 | * @dev: the device to obtain the handle for | |
b2b3e66e | 784 | */ |
6e5e959d | 785 | struct pinctrl *pinctrl_get(struct device *dev) |
b2b3e66e SW |
786 | { |
787 | struct pinctrl *p; | |
788 | ||
57b676f9 | 789 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 790 | p = pinctrl_get_locked(dev); |
57b676f9 | 791 | mutex_unlock(&pinctrl_mutex); |
b2b3e66e SW |
792 | |
793 | return p; | |
794 | } | |
befe5bdf LW |
795 | EXPORT_SYMBOL_GPL(pinctrl_get); |
796 | ||
d3cee830 RG |
797 | static void pinctrl_free_setting(bool disable_setting, |
798 | struct pinctrl_setting *setting) | |
799 | { | |
800 | switch (setting->type) { | |
801 | case PIN_MAP_TYPE_MUX_GROUP: | |
802 | if (disable_setting) | |
803 | pinmux_disable_setting(setting); | |
804 | pinmux_free_setting(setting); | |
805 | break; | |
806 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
807 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
808 | pinconf_free_setting(setting); | |
809 | break; | |
810 | default: | |
811 | break; | |
812 | } | |
813 | } | |
814 | ||
6e5e959d | 815 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist) |
befe5bdf | 816 | { |
6e5e959d SW |
817 | struct pinctrl_state *state, *n1; |
818 | struct pinctrl_setting *setting, *n2; | |
819 | ||
820 | list_for_each_entry_safe(state, n1, &p->states, node) { | |
821 | list_for_each_entry_safe(setting, n2, &state->settings, node) { | |
d3cee830 | 822 | pinctrl_free_setting(state == p->state, setting); |
6e5e959d SW |
823 | list_del(&setting->node); |
824 | kfree(setting); | |
825 | } | |
826 | list_del(&state->node); | |
827 | kfree(state); | |
7ecdb16f | 828 | } |
befe5bdf | 829 | |
57291ce2 SW |
830 | pinctrl_dt_free_maps(p); |
831 | ||
6e5e959d SW |
832 | if (inlist) |
833 | list_del(&p->node); | |
befe5bdf LW |
834 | kfree(p); |
835 | } | |
befe5bdf LW |
836 | |
837 | /** | |
ab78029e LW |
838 | * pinctrl_release() - release the pinctrl handle |
839 | * @kref: the kref in the pinctrl being released | |
840 | */ | |
2917e833 | 841 | static void pinctrl_release(struct kref *kref) |
ab78029e LW |
842 | { |
843 | struct pinctrl *p = container_of(kref, struct pinctrl, users); | |
844 | ||
845 | pinctrl_put_locked(p, true); | |
846 | } | |
847 | ||
848 | /** | |
849 | * pinctrl_put() - decrease use count on a previously claimed pinctrl handle | |
6e5e959d | 850 | * @p: the pinctrl handle to release |
befe5bdf | 851 | */ |
57b676f9 SW |
852 | void pinctrl_put(struct pinctrl *p) |
853 | { | |
854 | mutex_lock(&pinctrl_mutex); | |
ab78029e | 855 | kref_put(&p->users, pinctrl_release); |
57b676f9 SW |
856 | mutex_unlock(&pinctrl_mutex); |
857 | } | |
858 | EXPORT_SYMBOL_GPL(pinctrl_put); | |
859 | ||
6e5e959d SW |
860 | static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p, |
861 | const char *name) | |
befe5bdf | 862 | { |
6e5e959d | 863 | struct pinctrl_state *state; |
befe5bdf | 864 | |
6e5e959d | 865 | state = find_state(p, name); |
5b3aa5f7 DA |
866 | if (!state) { |
867 | if (pinctrl_dummy_state) { | |
868 | /* create dummy state */ | |
869 | dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", | |
870 | name); | |
871 | state = create_state(p, name); | |
d599bfb3 RG |
872 | } else |
873 | state = ERR_PTR(-ENODEV); | |
5b3aa5f7 | 874 | } |
57b676f9 | 875 | |
6e5e959d | 876 | return state; |
befe5bdf | 877 | } |
befe5bdf LW |
878 | |
879 | /** | |
6e5e959d SW |
880 | * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
881 | * @p: the pinctrl handle to retrieve the state from | |
882 | * @name: the state name to retrieve | |
befe5bdf | 883 | */ |
6e5e959d | 884 | struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name) |
57b676f9 | 885 | { |
6e5e959d SW |
886 | struct pinctrl_state *s; |
887 | ||
57b676f9 | 888 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 889 | s = pinctrl_lookup_state_locked(p, name); |
57b676f9 | 890 | mutex_unlock(&pinctrl_mutex); |
6e5e959d SW |
891 | |
892 | return s; | |
57b676f9 | 893 | } |
6e5e959d | 894 | EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
57b676f9 | 895 | |
6e5e959d SW |
896 | static int pinctrl_select_state_locked(struct pinctrl *p, |
897 | struct pinctrl_state *state) | |
befe5bdf | 898 | { |
6e5e959d | 899 | struct pinctrl_setting *setting, *setting2; |
50cf7c8a | 900 | struct pinctrl_state *old_state = p->state; |
6e5e959d | 901 | int ret; |
7ecdb16f | 902 | |
6e5e959d SW |
903 | if (p->state == state) |
904 | return 0; | |
befe5bdf | 905 | |
6e5e959d SW |
906 | if (p->state) { |
907 | /* | |
908 | * The set of groups with a mux configuration in the old state | |
909 | * may not be identical to the set of groups with a mux setting | |
910 | * in the new state. While this might be unusual, it's entirely | |
911 | * possible for the "user"-supplied mapping table to be written | |
912 | * that way. For each group that was configured in the old state | |
913 | * but not in the new state, this code puts that group into a | |
914 | * safe/disabled state. | |
915 | */ | |
916 | list_for_each_entry(setting, &p->state->settings, node) { | |
917 | bool found = false; | |
1e2082b5 SW |
918 | if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
919 | continue; | |
6e5e959d | 920 | list_for_each_entry(setting2, &state->settings, node) { |
1e2082b5 SW |
921 | if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) |
922 | continue; | |
923 | if (setting2->data.mux.group == | |
924 | setting->data.mux.group) { | |
6e5e959d SW |
925 | found = true; |
926 | break; | |
927 | } | |
928 | } | |
929 | if (!found) | |
930 | pinmux_disable_setting(setting); | |
931 | } | |
932 | } | |
933 | ||
3102a76c | 934 | p->state = NULL; |
6e5e959d SW |
935 | |
936 | /* Apply all the settings for the new state */ | |
937 | list_for_each_entry(setting, &state->settings, node) { | |
1e2082b5 SW |
938 | switch (setting->type) { |
939 | case PIN_MAP_TYPE_MUX_GROUP: | |
940 | ret = pinmux_enable_setting(setting); | |
941 | break; | |
942 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
943 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
944 | ret = pinconf_apply_setting(setting); | |
945 | break; | |
946 | default: | |
947 | ret = -EINVAL; | |
948 | break; | |
949 | } | |
3102a76c | 950 | |
6e5e959d | 951 | if (ret < 0) { |
3102a76c | 952 | goto unapply_new_state; |
6e5e959d | 953 | } |
befe5bdf | 954 | } |
6e5e959d | 955 | |
3102a76c RG |
956 | p->state = state; |
957 | ||
6e5e959d | 958 | return 0; |
3102a76c RG |
959 | |
960 | unapply_new_state: | |
961 | pr_info("Error applying setting, reverse things back\n"); | |
962 | ||
963 | /* | |
964 | * If the loop stopped on the 1st entry, nothing has been enabled, | |
965 | * so jump directly to the 2nd phase | |
966 | */ | |
967 | if (list_entry(&setting->node, typeof(*setting), node) == | |
968 | list_first_entry(&state->settings, typeof(*setting), node)) | |
969 | goto reapply_old_state; | |
970 | ||
971 | list_for_each_entry(setting2, &state->settings, node) { | |
972 | if (&setting2->node == &setting->node) | |
973 | break; | |
974 | pinctrl_free_setting(true, setting2); | |
975 | } | |
976 | reapply_old_state: | |
50cf7c8a RG |
977 | if (old_state) { |
978 | list_for_each_entry(setting, &old_state->settings, node) { | |
979 | bool found = false; | |
980 | if (setting->type != PIN_MAP_TYPE_MUX_GROUP) | |
981 | continue; | |
982 | list_for_each_entry(setting2, &state->settings, node) { | |
983 | if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) | |
984 | continue; | |
985 | if (setting2->data.mux.group == | |
986 | setting->data.mux.group) { | |
987 | found = true; | |
988 | break; | |
989 | } | |
990 | } | |
991 | if (!found) | |
992 | pinmux_enable_setting(setting); | |
993 | } | |
994 | } | |
3102a76c | 995 | return ret; |
57b676f9 SW |
996 | } |
997 | ||
998 | /** | |
6e5e959d SW |
999 | * pinctrl_select() - select/activate/program a pinctrl state to HW |
1000 | * @p: the pinctrl handle for the device that requests configuratio | |
1001 | * @state: the state handle to select/activate/program | |
57b676f9 | 1002 | */ |
6e5e959d | 1003 | int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
57b676f9 | 1004 | { |
6e5e959d SW |
1005 | int ret; |
1006 | ||
57b676f9 | 1007 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 1008 | ret = pinctrl_select_state_locked(p, state); |
57b676f9 | 1009 | mutex_unlock(&pinctrl_mutex); |
6e5e959d SW |
1010 | |
1011 | return ret; | |
befe5bdf | 1012 | } |
6e5e959d | 1013 | EXPORT_SYMBOL_GPL(pinctrl_select_state); |
befe5bdf | 1014 | |
6d4ca1fb SW |
1015 | static void devm_pinctrl_release(struct device *dev, void *res) |
1016 | { | |
1017 | pinctrl_put(*(struct pinctrl **)res); | |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * struct devm_pinctrl_get() - Resource managed pinctrl_get() | |
1022 | * @dev: the device to obtain the handle for | |
1023 | * | |
1024 | * If there is a need to explicitly destroy the returned struct pinctrl, | |
1025 | * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). | |
1026 | */ | |
1027 | struct pinctrl *devm_pinctrl_get(struct device *dev) | |
1028 | { | |
1029 | struct pinctrl **ptr, *p; | |
1030 | ||
1031 | ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); | |
1032 | if (!ptr) | |
1033 | return ERR_PTR(-ENOMEM); | |
1034 | ||
1035 | p = pinctrl_get(dev); | |
1036 | if (!IS_ERR(p)) { | |
1037 | *ptr = p; | |
1038 | devres_add(dev, ptr); | |
1039 | } else { | |
1040 | devres_free(ptr); | |
1041 | } | |
1042 | ||
1043 | return p; | |
1044 | } | |
1045 | EXPORT_SYMBOL_GPL(devm_pinctrl_get); | |
1046 | ||
1047 | static int devm_pinctrl_match(struct device *dev, void *res, void *data) | |
1048 | { | |
1049 | struct pinctrl **p = res; | |
1050 | ||
1051 | return *p == data; | |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * devm_pinctrl_put() - Resource managed pinctrl_put() | |
1056 | * @p: the pinctrl handle to release | |
1057 | * | |
1058 | * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally | |
1059 | * this function will not need to be called and the resource management | |
1060 | * code will ensure that the resource is freed. | |
1061 | */ | |
1062 | void devm_pinctrl_put(struct pinctrl *p) | |
1063 | { | |
a72149e8 | 1064 | WARN_ON(devres_release(p->dev, devm_pinctrl_release, |
6d4ca1fb | 1065 | devm_pinctrl_match, p)); |
6d4ca1fb SW |
1066 | } |
1067 | EXPORT_SYMBOL_GPL(devm_pinctrl_put); | |
1068 | ||
57291ce2 SW |
1069 | int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, |
1070 | bool dup, bool locked) | |
befe5bdf | 1071 | { |
1e2082b5 | 1072 | int i, ret; |
b2b3e66e | 1073 | struct pinctrl_maps *maps_node; |
befe5bdf LW |
1074 | |
1075 | pr_debug("add %d pinmux maps\n", num_maps); | |
1076 | ||
1077 | /* First sanity check the new mapping */ | |
1078 | for (i = 0; i < num_maps; i++) { | |
1e2082b5 SW |
1079 | if (!maps[i].dev_name) { |
1080 | pr_err("failed to register map %s (%d): no device given\n", | |
1081 | maps[i].name, i); | |
1082 | return -EINVAL; | |
1083 | } | |
1084 | ||
befe5bdf LW |
1085 | if (!maps[i].name) { |
1086 | pr_err("failed to register map %d: no map name given\n", | |
95dcd4ae | 1087 | i); |
befe5bdf LW |
1088 | return -EINVAL; |
1089 | } | |
1090 | ||
1e2082b5 SW |
1091 | if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
1092 | !maps[i].ctrl_dev_name) { | |
befe5bdf LW |
1093 | pr_err("failed to register map %s (%d): no pin control device given\n", |
1094 | maps[i].name, i); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1e2082b5 SW |
1098 | switch (maps[i].type) { |
1099 | case PIN_MAP_TYPE_DUMMY_STATE: | |
1100 | break; | |
1101 | case PIN_MAP_TYPE_MUX_GROUP: | |
1102 | ret = pinmux_validate_map(&maps[i], i); | |
1103 | if (ret < 0) | |
fde04f41 | 1104 | return ret; |
1e2082b5 SW |
1105 | break; |
1106 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
1107 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
1108 | ret = pinconf_validate_map(&maps[i], i); | |
1109 | if (ret < 0) | |
fde04f41 | 1110 | return ret; |
1e2082b5 SW |
1111 | break; |
1112 | default: | |
1113 | pr_err("failed to register map %s (%d): invalid type given\n", | |
95dcd4ae | 1114 | maps[i].name, i); |
1681f5ae SW |
1115 | return -EINVAL; |
1116 | } | |
befe5bdf LW |
1117 | } |
1118 | ||
b2b3e66e SW |
1119 | maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
1120 | if (!maps_node) { | |
1121 | pr_err("failed to alloc struct pinctrl_maps\n"); | |
1122 | return -ENOMEM; | |
1123 | } | |
befe5bdf | 1124 | |
b2b3e66e | 1125 | maps_node->num_maps = num_maps; |
57291ce2 SW |
1126 | if (dup) { |
1127 | maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, | |
1128 | GFP_KERNEL); | |
1129 | if (!maps_node->maps) { | |
1130 | pr_err("failed to duplicate mapping table\n"); | |
1131 | kfree(maps_node); | |
1132 | return -ENOMEM; | |
1133 | } | |
1134 | } else { | |
1135 | maps_node->maps = maps; | |
befe5bdf LW |
1136 | } |
1137 | ||
57291ce2 SW |
1138 | if (!locked) |
1139 | mutex_lock(&pinctrl_mutex); | |
b2b3e66e | 1140 | list_add_tail(&maps_node->node, &pinctrl_maps); |
57291ce2 SW |
1141 | if (!locked) |
1142 | mutex_unlock(&pinctrl_mutex); | |
b2b3e66e | 1143 | |
befe5bdf LW |
1144 | return 0; |
1145 | } | |
1146 | ||
57291ce2 SW |
1147 | /** |
1148 | * pinctrl_register_mappings() - register a set of pin controller mappings | |
1149 | * @maps: the pincontrol mappings table to register. This should probably be | |
1150 | * marked with __initdata so it can be discarded after boot. This | |
1151 | * function will perform a shallow copy for the mapping entries. | |
1152 | * @num_maps: the number of maps in the mapping table | |
1153 | */ | |
1154 | int pinctrl_register_mappings(struct pinctrl_map const *maps, | |
1155 | unsigned num_maps) | |
1156 | { | |
1157 | return pinctrl_register_map(maps, num_maps, true, false); | |
1158 | } | |
1159 | ||
1160 | void pinctrl_unregister_map(struct pinctrl_map const *map) | |
1161 | { | |
1162 | struct pinctrl_maps *maps_node; | |
1163 | ||
1164 | list_for_each_entry(maps_node, &pinctrl_maps, node) { | |
1165 | if (maps_node->maps == map) { | |
1166 | list_del(&maps_node->node); | |
1167 | return; | |
1168 | } | |
1169 | } | |
1170 | } | |
1171 | ||
840a47ba JD |
1172 | /** |
1173 | * pinctrl_force_sleep() - turn a given controller device into sleep state | |
1174 | * @pctldev: pin controller device | |
1175 | */ | |
1176 | int pinctrl_force_sleep(struct pinctrl_dev *pctldev) | |
1177 | { | |
1178 | if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep)) | |
1179 | return pinctrl_select_state(pctldev->p, pctldev->hog_sleep); | |
1180 | return 0; | |
1181 | } | |
1182 | EXPORT_SYMBOL_GPL(pinctrl_force_sleep); | |
1183 | ||
1184 | /** | |
1185 | * pinctrl_force_default() - turn a given controller device into default state | |
1186 | * @pctldev: pin controller device | |
1187 | */ | |
1188 | int pinctrl_force_default(struct pinctrl_dev *pctldev) | |
1189 | { | |
1190 | if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default)) | |
1191 | return pinctrl_select_state(pctldev->p, pctldev->hog_default); | |
1192 | return 0; | |
1193 | } | |
1194 | EXPORT_SYMBOL_GPL(pinctrl_force_default); | |
1195 | ||
2744e8af LW |
1196 | #ifdef CONFIG_DEBUG_FS |
1197 | ||
1198 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
1199 | { | |
1200 | struct pinctrl_dev *pctldev = s->private; | |
1201 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
706e8520 | 1202 | unsigned i, pin; |
2744e8af LW |
1203 | |
1204 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
2744e8af | 1205 | |
57b676f9 SW |
1206 | mutex_lock(&pinctrl_mutex); |
1207 | ||
706e8520 CP |
1208 | /* The pin number can be retrived from the pin controller descriptor */ |
1209 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
1210 | struct pin_desc *desc; |
1211 | ||
706e8520 | 1212 | pin = pctldev->desc->pins[i].number; |
2744e8af LW |
1213 | desc = pin_desc_get(pctldev, pin); |
1214 | /* Pin space may be sparse */ | |
1215 | if (desc == NULL) | |
1216 | continue; | |
1217 | ||
1218 | seq_printf(s, "pin %d (%s) ", pin, | |
1219 | desc->name ? desc->name : "unnamed"); | |
1220 | ||
1221 | /* Driver-specific info per pin */ | |
1222 | if (ops->pin_dbg_show) | |
1223 | ops->pin_dbg_show(pctldev, s, pin); | |
1224 | ||
1225 | seq_puts(s, "\n"); | |
1226 | } | |
1227 | ||
57b676f9 SW |
1228 | mutex_unlock(&pinctrl_mutex); |
1229 | ||
2744e8af LW |
1230 | return 0; |
1231 | } | |
1232 | ||
1233 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
1234 | { | |
1235 | struct pinctrl_dev *pctldev = s->private; | |
1236 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
d1e90e9e | 1237 | unsigned ngroups, selector = 0; |
2744e8af | 1238 | |
d1e90e9e | 1239 | ngroups = ops->get_groups_count(pctldev); |
57b676f9 SW |
1240 | mutex_lock(&pinctrl_mutex); |
1241 | ||
2744e8af | 1242 | seq_puts(s, "registered pin groups:\n"); |
d1e90e9e | 1243 | while (selector < ngroups) { |
a5818a8b | 1244 | const unsigned *pins; |
2744e8af LW |
1245 | unsigned num_pins; |
1246 | const char *gname = ops->get_group_name(pctldev, selector); | |
dcb5dbc3 | 1247 | const char *pname; |
2744e8af LW |
1248 | int ret; |
1249 | int i; | |
1250 | ||
1251 | ret = ops->get_group_pins(pctldev, selector, | |
1252 | &pins, &num_pins); | |
1253 | if (ret) | |
1254 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
1255 | gname); | |
1256 | else { | |
dcb5dbc3 DA |
1257 | seq_printf(s, "group: %s\n", gname); |
1258 | for (i = 0; i < num_pins; i++) { | |
1259 | pname = pin_get_name(pctldev, pins[i]); | |
b4dd784b WY |
1260 | if (WARN_ON(!pname)) { |
1261 | mutex_unlock(&pinctrl_mutex); | |
dcb5dbc3 | 1262 | return -EINVAL; |
b4dd784b | 1263 | } |
dcb5dbc3 DA |
1264 | seq_printf(s, "pin %d (%s)\n", pins[i], pname); |
1265 | } | |
1266 | seq_puts(s, "\n"); | |
2744e8af LW |
1267 | } |
1268 | selector++; | |
1269 | } | |
1270 | ||
57b676f9 | 1271 | mutex_unlock(&pinctrl_mutex); |
2744e8af LW |
1272 | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
1277 | { | |
1278 | struct pinctrl_dev *pctldev = s->private; | |
1279 | struct pinctrl_gpio_range *range = NULL; | |
1280 | ||
1281 | seq_puts(s, "GPIO ranges handled:\n"); | |
1282 | ||
57b676f9 SW |
1283 | mutex_lock(&pinctrl_mutex); |
1284 | ||
2744e8af | 1285 | /* Loop over the ranges */ |
2744e8af | 1286 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
75d6642a LW |
1287 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
1288 | range->id, range->name, | |
1289 | range->base, (range->base + range->npins - 1), | |
1290 | range->pin_base, | |
1291 | (range->pin_base + range->npins - 1)); | |
2744e8af | 1292 | } |
57b676f9 SW |
1293 | |
1294 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1295 | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static int pinctrl_devices_show(struct seq_file *s, void *what) | |
1300 | { | |
1301 | struct pinctrl_dev *pctldev; | |
1302 | ||
ae6b4d85 | 1303 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
57b676f9 SW |
1304 | |
1305 | mutex_lock(&pinctrl_mutex); | |
1306 | ||
2744e8af LW |
1307 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
1308 | seq_printf(s, "%s ", pctldev->desc->name); | |
1309 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
1310 | seq_puts(s, "yes "); |
1311 | else | |
1312 | seq_puts(s, "no "); | |
1313 | if (pctldev->desc->confops) | |
2744e8af LW |
1314 | seq_puts(s, "yes"); |
1315 | else | |
1316 | seq_puts(s, "no"); | |
1317 | seq_puts(s, "\n"); | |
1318 | } | |
57b676f9 SW |
1319 | |
1320 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1321 | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1e2082b5 SW |
1325 | static inline const char *map_type(enum pinctrl_map_type type) |
1326 | { | |
1327 | static const char * const names[] = { | |
1328 | "INVALID", | |
1329 | "DUMMY_STATE", | |
1330 | "MUX_GROUP", | |
1331 | "CONFIGS_PIN", | |
1332 | "CONFIGS_GROUP", | |
1333 | }; | |
1334 | ||
1335 | if (type >= ARRAY_SIZE(names)) | |
1336 | return "UNKNOWN"; | |
1337 | ||
1338 | return names[type]; | |
1339 | } | |
1340 | ||
3eedb437 SW |
1341 | static int pinctrl_maps_show(struct seq_file *s, void *what) |
1342 | { | |
1343 | struct pinctrl_maps *maps_node; | |
1344 | int i; | |
1345 | struct pinctrl_map const *map; | |
1346 | ||
1347 | seq_puts(s, "Pinctrl maps:\n"); | |
1348 | ||
57b676f9 SW |
1349 | mutex_lock(&pinctrl_mutex); |
1350 | ||
3eedb437 | 1351 | for_each_maps(maps_node, i, map) { |
1e2082b5 SW |
1352 | seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
1353 | map->dev_name, map->name, map_type(map->type), | |
1354 | map->type); | |
1355 | ||
1356 | if (map->type != PIN_MAP_TYPE_DUMMY_STATE) | |
1357 | seq_printf(s, "controlling device %s\n", | |
1358 | map->ctrl_dev_name); | |
1359 | ||
1360 | switch (map->type) { | |
1361 | case PIN_MAP_TYPE_MUX_GROUP: | |
1362 | pinmux_show_map(s, map); | |
1363 | break; | |
1364 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
1365 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
1366 | pinconf_show_map(s, map); | |
1367 | break; | |
1368 | default: | |
1369 | break; | |
1370 | } | |
1371 | ||
1372 | seq_printf(s, "\n"); | |
3eedb437 | 1373 | } |
57b676f9 SW |
1374 | |
1375 | mutex_unlock(&pinctrl_mutex); | |
3eedb437 SW |
1376 | |
1377 | return 0; | |
1378 | } | |
1379 | ||
befe5bdf LW |
1380 | static int pinctrl_show(struct seq_file *s, void *what) |
1381 | { | |
1382 | struct pinctrl *p; | |
6e5e959d | 1383 | struct pinctrl_state *state; |
7ecdb16f | 1384 | struct pinctrl_setting *setting; |
befe5bdf LW |
1385 | |
1386 | seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); | |
57b676f9 SW |
1387 | |
1388 | mutex_lock(&pinctrl_mutex); | |
1389 | ||
befe5bdf | 1390 | list_for_each_entry(p, &pinctrl_list, node) { |
6e5e959d SW |
1391 | seq_printf(s, "device: %s current state: %s\n", |
1392 | dev_name(p->dev), | |
1393 | p->state ? p->state->name : "none"); | |
1394 | ||
1395 | list_for_each_entry(state, &p->states, node) { | |
1396 | seq_printf(s, " state: %s\n", state->name); | |
befe5bdf | 1397 | |
6e5e959d | 1398 | list_for_each_entry(setting, &state->settings, node) { |
1e2082b5 SW |
1399 | struct pinctrl_dev *pctldev = setting->pctldev; |
1400 | ||
1401 | seq_printf(s, " type: %s controller %s ", | |
1402 | map_type(setting->type), | |
1403 | pinctrl_dev_get_name(pctldev)); | |
1404 | ||
1405 | switch (setting->type) { | |
1406 | case PIN_MAP_TYPE_MUX_GROUP: | |
1407 | pinmux_show_setting(s, setting); | |
1408 | break; | |
1409 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
1410 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
1411 | pinconf_show_setting(s, setting); | |
1412 | break; | |
1413 | default: | |
1414 | break; | |
1415 | } | |
6e5e959d | 1416 | } |
befe5bdf | 1417 | } |
befe5bdf LW |
1418 | } |
1419 | ||
57b676f9 SW |
1420 | mutex_unlock(&pinctrl_mutex); |
1421 | ||
befe5bdf LW |
1422 | return 0; |
1423 | } | |
1424 | ||
2744e8af LW |
1425 | static int pinctrl_pins_open(struct inode *inode, struct file *file) |
1426 | { | |
1427 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
1428 | } | |
1429 | ||
1430 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
1431 | { | |
1432 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
1433 | } | |
1434 | ||
1435 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
1436 | { | |
1437 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
1438 | } | |
1439 | ||
1440 | static int pinctrl_devices_open(struct inode *inode, struct file *file) | |
1441 | { | |
1442 | return single_open(file, pinctrl_devices_show, NULL); | |
1443 | } | |
1444 | ||
3eedb437 SW |
1445 | static int pinctrl_maps_open(struct inode *inode, struct file *file) |
1446 | { | |
1447 | return single_open(file, pinctrl_maps_show, NULL); | |
1448 | } | |
1449 | ||
befe5bdf LW |
1450 | static int pinctrl_open(struct inode *inode, struct file *file) |
1451 | { | |
1452 | return single_open(file, pinctrl_show, NULL); | |
1453 | } | |
1454 | ||
2744e8af LW |
1455 | static const struct file_operations pinctrl_pins_ops = { |
1456 | .open = pinctrl_pins_open, | |
1457 | .read = seq_read, | |
1458 | .llseek = seq_lseek, | |
1459 | .release = single_release, | |
1460 | }; | |
1461 | ||
1462 | static const struct file_operations pinctrl_groups_ops = { | |
1463 | .open = pinctrl_groups_open, | |
1464 | .read = seq_read, | |
1465 | .llseek = seq_lseek, | |
1466 | .release = single_release, | |
1467 | }; | |
1468 | ||
1469 | static const struct file_operations pinctrl_gpioranges_ops = { | |
1470 | .open = pinctrl_gpioranges_open, | |
1471 | .read = seq_read, | |
1472 | .llseek = seq_lseek, | |
1473 | .release = single_release, | |
1474 | }; | |
1475 | ||
3eedb437 SW |
1476 | static const struct file_operations pinctrl_devices_ops = { |
1477 | .open = pinctrl_devices_open, | |
befe5bdf LW |
1478 | .read = seq_read, |
1479 | .llseek = seq_lseek, | |
1480 | .release = single_release, | |
1481 | }; | |
1482 | ||
3eedb437 SW |
1483 | static const struct file_operations pinctrl_maps_ops = { |
1484 | .open = pinctrl_maps_open, | |
2744e8af LW |
1485 | .read = seq_read, |
1486 | .llseek = seq_lseek, | |
1487 | .release = single_release, | |
1488 | }; | |
1489 | ||
befe5bdf LW |
1490 | static const struct file_operations pinctrl_ops = { |
1491 | .open = pinctrl_open, | |
1492 | .read = seq_read, | |
1493 | .llseek = seq_lseek, | |
1494 | .release = single_release, | |
1495 | }; | |
1496 | ||
2744e8af LW |
1497 | static struct dentry *debugfs_root; |
1498 | ||
1499 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1500 | { | |
02157160 | 1501 | struct dentry *device_root; |
2744e8af | 1502 | |
51cd24ee | 1503 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af | 1504 | debugfs_root); |
02157160 TL |
1505 | pctldev->device_root = device_root; |
1506 | ||
2744e8af LW |
1507 | if (IS_ERR(device_root) || !device_root) { |
1508 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 1509 | dev_name(pctldev->dev)); |
2744e8af LW |
1510 | return; |
1511 | } | |
1512 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
1513 | device_root, pctldev, &pinctrl_pins_ops); | |
1514 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
1515 | device_root, pctldev, &pinctrl_groups_ops); | |
1516 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
1517 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
1518 | pinmux_init_device_debugfs(device_root, pctldev); | |
ae6b4d85 | 1519 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
1520 | } |
1521 | ||
02157160 TL |
1522 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1523 | { | |
1524 | debugfs_remove_recursive(pctldev->device_root); | |
1525 | } | |
1526 | ||
2744e8af LW |
1527 | static void pinctrl_init_debugfs(void) |
1528 | { | |
1529 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
1530 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
1531 | pr_warn("failed to create debugfs directory\n"); | |
1532 | debugfs_root = NULL; | |
1533 | return; | |
1534 | } | |
1535 | ||
1536 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
1537 | debugfs_root, NULL, &pinctrl_devices_ops); | |
3eedb437 SW |
1538 | debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
1539 | debugfs_root, NULL, &pinctrl_maps_ops); | |
befe5bdf LW |
1540 | debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
1541 | debugfs_root, NULL, &pinctrl_ops); | |
2744e8af LW |
1542 | } |
1543 | ||
1544 | #else /* CONFIG_DEBUG_FS */ | |
1545 | ||
1546 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1547 | { | |
1548 | } | |
1549 | ||
1550 | static void pinctrl_init_debugfs(void) | |
1551 | { | |
1552 | } | |
1553 | ||
02157160 TL |
1554 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1555 | { | |
1556 | } | |
1557 | ||
2744e8af LW |
1558 | #endif |
1559 | ||
d26bc49f SW |
1560 | static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
1561 | { | |
1562 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
1563 | ||
1564 | if (!ops || | |
d1e90e9e | 1565 | !ops->get_groups_count || |
d26bc49f SW |
1566 | !ops->get_group_name || |
1567 | !ops->get_group_pins) | |
1568 | return -EINVAL; | |
1569 | ||
57291ce2 SW |
1570 | if (ops->dt_node_to_map && !ops->dt_free_map) |
1571 | return -EINVAL; | |
1572 | ||
d26bc49f SW |
1573 | return 0; |
1574 | } | |
1575 | ||
2744e8af LW |
1576 | /** |
1577 | * pinctrl_register() - register a pin controller device | |
1578 | * @pctldesc: descriptor for this pin controller | |
1579 | * @dev: parent device for this pin controller | |
1580 | * @driver_data: private pin controller data for this pin controller | |
1581 | */ | |
1582 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
1583 | struct device *dev, void *driver_data) | |
1584 | { | |
2744e8af LW |
1585 | struct pinctrl_dev *pctldev; |
1586 | int ret; | |
1587 | ||
da9aecb0 | 1588 | if (!pctldesc) |
2744e8af | 1589 | return NULL; |
da9aecb0 | 1590 | if (!pctldesc->name) |
2744e8af LW |
1591 | return NULL; |
1592 | ||
02f5b989 | 1593 | pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
95dcd4ae SW |
1594 | if (pctldev == NULL) { |
1595 | dev_err(dev, "failed to alloc struct pinctrl_dev\n"); | |
b9130b77 | 1596 | return NULL; |
95dcd4ae | 1597 | } |
b9130b77 TL |
1598 | |
1599 | /* Initialize pin control device struct */ | |
1600 | pctldev->owner = pctldesc->owner; | |
1601 | pctldev->desc = pctldesc; | |
1602 | pctldev->driver_data = driver_data; | |
1603 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
b9130b77 | 1604 | INIT_LIST_HEAD(&pctldev->gpio_ranges); |
b9130b77 TL |
1605 | pctldev->dev = dev; |
1606 | ||
d26bc49f | 1607 | /* check core ops for sanity */ |
da9aecb0 | 1608 | if (pinctrl_check_ops(pctldev)) { |
ad6e1107 | 1609 | dev_err(dev, "pinctrl ops lacks necessary functions\n"); |
d26bc49f SW |
1610 | goto out_err; |
1611 | } | |
1612 | ||
2744e8af LW |
1613 | /* If we're implementing pinmuxing, check the ops for sanity */ |
1614 | if (pctldesc->pmxops) { | |
da9aecb0 | 1615 | if (pinmux_check_ops(pctldev)) |
b9130b77 | 1616 | goto out_err; |
2744e8af LW |
1617 | } |
1618 | ||
ae6b4d85 LW |
1619 | /* If we're implementing pinconfig, check the ops for sanity */ |
1620 | if (pctldesc->confops) { | |
da9aecb0 | 1621 | if (pinconf_check_ops(pctldev)) |
b9130b77 | 1622 | goto out_err; |
ae6b4d85 LW |
1623 | } |
1624 | ||
2744e8af | 1625 | /* Register all the pins */ |
ad6e1107 | 1626 | dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); |
2744e8af LW |
1627 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
1628 | if (ret) { | |
ad6e1107 | 1629 | dev_err(dev, "error during pin registration\n"); |
2744e8af LW |
1630 | pinctrl_free_pindescs(pctldev, pctldesc->pins, |
1631 | pctldesc->npins); | |
51cd24ee | 1632 | goto out_err; |
2744e8af LW |
1633 | } |
1634 | ||
57b676f9 SW |
1635 | mutex_lock(&pinctrl_mutex); |
1636 | ||
8b9c139f | 1637 | list_add_tail(&pctldev->node, &pinctrldev_list); |
57b676f9 | 1638 | |
6e5e959d SW |
1639 | pctldev->p = pinctrl_get_locked(pctldev->dev); |
1640 | if (!IS_ERR(pctldev->p)) { | |
840a47ba | 1641 | pctldev->hog_default = |
6e5e959d SW |
1642 | pinctrl_lookup_state_locked(pctldev->p, |
1643 | PINCTRL_STATE_DEFAULT); | |
840a47ba | 1644 | if (IS_ERR(pctldev->hog_default)) { |
ad6e1107 JC |
1645 | dev_dbg(dev, "failed to lookup the default state\n"); |
1646 | } else { | |
840a47ba JD |
1647 | if (pinctrl_select_state_locked(pctldev->p, |
1648 | pctldev->hog_default)) | |
ad6e1107 JC |
1649 | dev_err(dev, |
1650 | "failed to select default state\n"); | |
ad6e1107 | 1651 | } |
840a47ba JD |
1652 | |
1653 | pctldev->hog_sleep = | |
1654 | pinctrl_lookup_state_locked(pctldev->p, | |
1655 | PINCTRL_STATE_SLEEP); | |
1656 | if (IS_ERR(pctldev->hog_sleep)) | |
1657 | dev_dbg(dev, "failed to lookup the sleep state\n"); | |
6e5e959d | 1658 | } |
57b676f9 SW |
1659 | |
1660 | mutex_unlock(&pinctrl_mutex); | |
1661 | ||
2304b473 SW |
1662 | pinctrl_init_device_debugfs(pctldev); |
1663 | ||
2744e8af LW |
1664 | return pctldev; |
1665 | ||
51cd24ee SW |
1666 | out_err: |
1667 | kfree(pctldev); | |
2744e8af LW |
1668 | return NULL; |
1669 | } | |
1670 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
1671 | ||
1672 | /** | |
1673 | * pinctrl_unregister() - unregister pinmux | |
1674 | * @pctldev: pin controller to unregister | |
1675 | * | |
1676 | * Called by pinmux drivers to unregister a pinmux. | |
1677 | */ | |
1678 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
1679 | { | |
5d589b09 | 1680 | struct pinctrl_gpio_range *range, *n; |
2744e8af LW |
1681 | if (pctldev == NULL) |
1682 | return; | |
1683 | ||
02157160 | 1684 | pinctrl_remove_device_debugfs(pctldev); |
57b676f9 SW |
1685 | |
1686 | mutex_lock(&pinctrl_mutex); | |
1687 | ||
6e5e959d SW |
1688 | if (!IS_ERR(pctldev->p)) |
1689 | pinctrl_put_locked(pctldev->p, true); | |
57b676f9 | 1690 | |
2744e8af | 1691 | /* TODO: check that no pinmuxes are still active? */ |
2744e8af | 1692 | list_del(&pctldev->node); |
2744e8af LW |
1693 | /* Destroy descriptor tree */ |
1694 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
1695 | pctldev->desc->npins); | |
5d589b09 DA |
1696 | /* remove gpio ranges map */ |
1697 | list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) | |
1698 | list_del(&range->node); | |
1699 | ||
51cd24ee | 1700 | kfree(pctldev); |
57b676f9 SW |
1701 | |
1702 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1703 | } |
1704 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
1705 | ||
1706 | static int __init pinctrl_init(void) | |
1707 | { | |
1708 | pr_info("initialized pinctrl subsystem\n"); | |
1709 | pinctrl_init_debugfs(); | |
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | /* init early since many drivers really need to initialized pinmux early */ | |
1714 | core_initcall(pinctrl_init); |